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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 104 (Electronically Controlled Brake System (HV) - Diagnostic Codes (03 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C0512-23: Right Rear Wheel Speed Sensor Signal Stuck Low [10/2021 - 11/2023] >> Procedure

DTC C0512-23: Right Rear Wheel Speed Sensor Signal Stuck Low [10/2021 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK VEHICLE SPECIFICATION 
    1. Check the vehicle specification.

      Result

      Result Proceed to
      for AWD. A
      for 2WD. B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  2

  2. CHECK REAR SKID CONTROL SENSOR RH INSTALLATION 
    1. Check the rear skid control sensor RH installation.
      GTY453396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Skid Control Sensor RH
      *a Correct
      *b Incorrect
      *c 8.5 N*m (87 kgf*cm, 75 in.*lbf)
      *d No clearance

      OK

      There is no clearance between the rear skid control sensor RH and the rear axle carrier RH.

      The installation bolt is tightened properly.

      Torque 

      8.5 N*m (87 kgf*cm, 75 in.*lbf)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL OR REPLACE REAR SKID CONTROL SENSOR RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK REAR SKID CONTROL SENSOR RH (CHECK FOR FOREIGN MATTER) 
    1. Remove the rear skid control sensor RH.

      Refer to REMOVAL [12/2019 - ]

    2. Check the rear skid control sensor tip RH.

      OK

      The rear skid control sensor tip RH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the rear skid control sensor RH, clean the rear skid control sensor RH.
      • If the rear skid control sensor RH is damaged, replace the rear skid control sensor RH with a new one.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CLEAN OR REPLACE REAR SKID CONTROL SENSOR RH 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING GTS (RR WHEEL SPEED) 
    1. Perform a road test.
    2. Check the rear skid control sensor RH output value.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0.0 km/h (0 mph)
      Max.: 6553.5 km/h (4072 mph)      		 Vehicle stopped: 0.0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > Brake/EPB > Data List 

      Tester Display
      RR Wheel Speed

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  5

  5. INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY 
    1. Turn the ignition switch off.
      GTY974268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire RH (No. 1 parking brake wire assembly)
      *b to Sensor Side Connector
      *c to Vehicle Side Connector
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the u3 and uM1 skid control sensor wire RH (No. 1 parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      u3-1 (+) - uM1-3 (RR+) Always Below 1 Ω
      u3-1 (+) or uM1-3 (RR+) - Body ground and other terminals Always 10 kΩ or higher
      u3-2 (-) - uM1-4 (RR-) Always Below 1 Ω
      u3-2 (-) or uM1-4 (RR-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (NO. 1 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A57 No. 2 skid control ECU (brake actuator assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      uM1-3 (RR+) - A57-20 (RR+) Always Below 1 Ω
      uM1-3 (RR+) or A57-20 (RR+) - Body ground Always 10 kΩ or higher
      uM1-4 (RR-) - A57-19 (RR-) Always Below 1 Ω
      uM1-4 (RR-) or A57-19 (RR-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK REAR SPEED SENSOR ROTOR RH (CHECK FOR FOREIGN MATTER) 
    1. Remove the component with the rear speed sensor rotor RH.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    2. Check the rear speed sensor rotor RH.

      OK

      The rear speed sensor rotor RH is free of scratches, oil, and foreign matter.

      NOTE:
      • If there is oil or foreign matter on the rear speed sensor rotor RH, clean the rear speed sensor rotor RH.
      • Do not use parts cleaner when cleaning the rear speed sensor rotor RH.
      • If the rear speed sensor rotor RH is damaged, replace the rear speed sensor rotor RH with a new one.

      HINT: 

      The rear speed sensor rotor RH is incorporated into the rear axle hub and bearing assembly RH.

      If the rear speed sensor rotor RH needs to be replaced, replace it together with the rear axle hub and bearing assembly RH.

      Result

      Result Proceed to
      OK A
      NG (The rear speed sensor rotor RH is damaged.) B
      NG (There is foreign matter on the rear speed sensor rotor RH.) C

    Result: 

    A 

    REPLACE REAR SKID CONTROL SENSOR RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    B 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    C 

    CLEAN REAR SPEED SENSOR ROTOR RH 

  8. CHECK REAR SPEED SENSOR RH INSTALLATION 
    1. Check the rear speed sensor RH installation.
      GTY423344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Rear Speed Sensor RH
      *a Correct
      *b Incorrect
      *c No clearance

      OK

      There is no clearance between the rear speed sensor RH and the rear axle hub and bearing assembly RH.

      HINT: 

      Because the rear axle hub and bearing assembly RH cannot be disassembled, if the rear speed sensor RH needs replacement, replace the rear axle hub and bearing assembly RH.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    OK 

    See step  9

  9. READ VALUE USING GTS (RR WHEEL SPEED) 
    1. Perform a road test.
    2. Check the rear speed sensor RH output value.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0.0 km/h (0 mph)
      Max.: 6553.5 km/h (4072 mph)      		 Vehicle stopped: 0.0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > Brake/EPB > Data List 

      Tester Display
      RR Wheel Speed

      OK

      The output value changes in accordance with the vehicle speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  10

  10. INSPECT NO. 1 PARKING BRAKE WIRE ASSEMBLY 
    1. Turn the ignition switch off.
      GTY974267Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of skid control sensor wire RH (No. 1 parking brake wire assembly)
      *b to Sensor Side Connector
      *c to Vehicle Side Connector
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the u3 and uM1 skid control sensor wire RH (No. 1 parking brake wire assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      u3-2 (+) - uM1-3 (RR+) Always Below 1 Ω
      u3-2 (+) or uM1-3 (RR+) - Body ground and other terminals Always 10 kΩ or higher
      u3-1 (-) - uM1-4 (RR-) Always Below 1 Ω
      u3-1 (-) or uM1-4 (RR-) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 PARKING BRAKE WIRE ASSEMBLY 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (NO. 1 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A57 No. 2 skid control ECU (brake actuator assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      uM1-3 (RR+) - A57-20 (RR+) Always Below 1 Ω
      uM1-3 (RR+) or A57-20 (RR+) - Body ground Always 10 kΩ or higher
      uM1-4 (RR-) - A57-19 (RR-) Always Below 1 Ω
      uM1-4 (RR-) or A57-19 (RR-) - Body ground Always 10 kΩ or higher

      HINT: 

      The rear speed sensor RH and rear speed sensor rotor RH are incorporated into the rear axle hub and bearing assembly RH.

      If the rear speed sensor RH and rear speed sensor rotor RH need to be replaced, replace the rear axle hub and bearing assembly RH.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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